PURPOSE: To increase workability by fitting an end rail by use of decoration panels at a beam of front face forming a structure of an attached house.

CONSTITUTION: A cantilever beam 3 protruding outward to make right angles with a beam 2 of a house body H and to be parallel with each other is provided at the beam 2 and the outer distance of the cantilever beams 3 are connected to each other by the beam of front face 4 having a continuous recession B in the longitudinal direction at the upper face. A decoration panel 7 provided with an end rail 6 in which the lower end of the external plate 9 of the wall panel PW2 forming the external wall WA of an attached house A at the outer face of base part 5 fitted to the recession B of the front beam, to join with the upper end of the external plate, is attached to fit into the recession B of the base 5 of the front beam 4.